Stroller frame



FIG. 1 is a top front perspective view of a stroller frame showing theclaimed design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures show portions of the stroller frame thatform no part of the claimed design.

CLAIM The ornamental design for a stroller frame, as shown anddescribed.